The chemistry of N-substituted benzotriazoles. Part 2. Reactions of benzotriazole with aldehydes and aldehyde derivatives. 1-(α-Hydroxyalkyl)-, 1-(α-alkoxyalkyl)-, and 1-(α-acyloxyalkyl)benzotriazoles

Benzotriazole reacts readily with a variety of aldehydes to yield crystalline 1:1 adducts characterized by strong hydrogen bonding. Corresponding 1-(α-alkoxyalkyl)benzotriazoles are formed in the presence of alcohols, and 1-(α-acetoxyalkyl) analogues result from aldehyde diacetoxy derivatives. The products of more complex reactions between benzotriazoles and unsaturated aldehydes are elucidated.